Not feedback per se, but we have a similar product here in Australia called YourTutor (http://www.yourtutor.com.au/) which most schools/libraries have on offer. So perhaps you could take on some similar ideas?

Looks like a great product, having a listing of tutors that would be helping, and possibly having times when it's available (or is it 24/7?) on the website may encourage more use.

To try it out just email me (email in bio) and I can send you free minutes.

Similarly if anyone is in high school or has a child in high school I'll hook you up with free tutoring, all I want in return is feedback!